Wu, Yandan
Li, Chunxiao http://orcid.org/0000-0002-9959-5029
Funding for this research was provided by:
National Social Science Fund (15BTY071)
Article History
Received: 30 August 2017
Accepted: 10 May 2018
First Online: 19 May 2018
Compliance with Ethical Standards
: Ethical standards were followed when conducted this research.
: The authors declare that they have no conflict of interest.